Headers w./cats in Calif... yearly swapable? - Pontiac G8 Forum: G8 Forums - G8Board.com
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #1 of 24 (permalink) Old 12-25-2017, 08:23 PM Thread Starter
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Headers w./cats in Calif... yearly swapable?

I'm looking for a setup that I can easily swap off the car for the bi-annual SMOG inspection necessary here in Calif. If I could have a flange down the pipe, say in front of the resonator, then I could fairly easily swap them out for inspections, right? Is there something I'm forgetting about here?

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post #2 of 24 (permalink) Old 12-25-2017, 09:04 PM
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Kooks Mids with high flow cats will bolt directly to the stock cat back. That's what I'm using with Borla catback. I kept my stock exhaust manifold just in case I can't bribe a local shop to pass me.

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post #3 of 24 (permalink) Old 12-25-2017, 09:48 PM
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Yup, what he said. Kooks Mids with their high flow cats.

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post #4 of 24 (permalink) Old 12-26-2017, 08:50 AM Thread Starter
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So you're saying that they'll pass a visual inspection? Are those cats in the same position as the stock ones? Does that setup carry a CARB endorsement? I'm assuming IF they were to sniff 'em they'd be within the limit, but it's the visual I'm concerned with. So you're saying they're no longet than the factory manifold, downpipes and converters are, thereby just unbolting the header bolts and those at the flange is all that's needed to remove them from the car? Onna lift, that shouldn't take too long. Is there a bung for the O2 sensor and is it close enough for stock wiring to reach, or will an extension be needed?

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post #5 of 24 (permalink) Old 12-26-2017, 10:26 AM
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Originally Posted by NTrails View Post
So you're saying that they'll pass a visual inspection? Are those cats in the same position as the stock ones? Does that setup carry a CARB endorsement? I'm assuming IF they were to sniff 'em they'd be within the limit, but it's the visual I'm concerned with. So you're saying they're no longet than the factory manifold, downpipes and converters are, thereby just unbolting the header bolts and those at the flange is all that's needed to remove them from the car? Onna lift, that shouldn't take too long. Is there a bung for the O2 sensor and is it close enough for stock wiring to reach, or will an extension be needed?
Your original post asks about headers that you can easily swap out. If you want something that is going to pass in CA, then you'd be better off looking at either Dough Thorley or SW shorty headers, since they don't replace the OEM cats. Solo has high flow cats that you may want to look into. They look similar to the OEM cats but I don't know if they are legal in CA so you'd have to contact them.

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post #6 of 24 (permalink) Old 12-26-2017, 10:28 AM
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Quote:
Originally Posted by NTrails View Post
So you're saying that they'll pass a visual inspection? Are those cats in the same position as the stock ones? Does that setup carry a CARB endorsement? I'm assuming IF they were to sniff 'em they'd be within the limit, but it's the visual I'm concerned with. So you're saying they're no longet than the factory manifold, downpipes and converters are, thereby just unbolting the header bolts and those at the flange is all that's needed to remove them from the car? Onna lift, that shouldn't take too long. Is there a bung for the O2 sensor and is it close enough for stock wiring to reach, or will an extension be needed?
The Kooks Mids and cats are NOT Carb legal in Cali. They will not pass smog inspection. The cats are in the same location as stock and the O2 sensors are in the same location as well. They are direct replacement for stock manifold and cats.

There is no sniffer test for these cars. It's all OBD2 emissions readiness status. You will need a tune because it will throw a downstream O2 code that needs to be tuned out or else the car will fail smog for that alone. This assumes that you will pay extra cash to a smog shop to ignore the fact that you have illegal headers.

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post #7 of 24 (permalink) Old 12-26-2017, 10:40 AM
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Also...... Some guys will tell you not to waste your money on anything other than long tube headers. You may be tempted to buy long tubes but remember this.... long tube headers most likely won't bolt up to your stock exhaust system without modification. Kooks long tubes for sure won't so that means if you can't find a shop that will look the other way on your headers, you can no longer easily swap them out with your stock exhaust manifolds because you've had to alter your stock catback in some way.

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post #8 of 24 (permalink) Old 12-26-2017, 10:52 AM
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I live in Ontario and my mechanic told me as long as I have cats (or what looks like cats) and no check engines (tune), I should be fine.

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post #9 of 24 (permalink) Old 12-26-2017, 11:22 AM
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Originally Posted by GTRenegade911 View Post
I live in Ontario and my mechanic told me as long as I have cats (or what looks like cats) and no check engines (tune), I should be fine.
Cali isn't nearly as forgiving lol

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post #10 of 24 (permalink) Old 12-26-2017, 01:48 PM
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Originally Posted by davidfoster View Post
Cali isn't nearly as forgiving lol
They probably have the toughest car regulations.

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post #11 of 24 (permalink) Old 12-26-2017, 02:19 PM
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Step 1: buy long tube headers
Step 2: buy Pacesetter header extensions
Step 3: weld those two together because the clamps suck
Step 4: bolt up to stock catback
Step 5: voila
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post #12 of 24 (permalink) Old 12-26-2017, 02:20 PM
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Almost forgot you also need a O2 sensor extension
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post #13 of 24 (permalink) Old 12-26-2017, 02:42 PM
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Buy the LTs, forget about swapping them yearly. Find a sympathetic shop, and pay the money. Done.
You can do mid's and chances are the smog guy wont even blink at them unless your car has a lot of mods. If you're gonna be flashy, maybe coat the mid lengths and use them and the stock pipes.

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post #14 of 24 (permalink) Old 12-26-2017, 10:11 PM Thread Starter
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I'm not gonna hang my hat on finding a SMOG station willing to risk their entire business by illegally giving me a PASS on my visual inspection out of the goodness ("sympathetic"?) of their heart... doesn't sound likely. And those who say "put headers onnitt and forget about it..." don't realize that I'd not be able to drive, or even park the car on any street if I did! Not really a viable option for me.
I guess I'm fixated on these "Mid-Pipes" and what the difficulty in removing them (and possibly the cats associated with them) and replacing the factory manifold (and cats, if...) every 2 years for the inspection. I mean, how bad does that Mid-Pipe and Hi-Flow Cat setup look? I'd certainly have it tuned to run properly with whatever setup I'd be running... even re-tuning it for the factory stuff if needed for the inspection, then again afterwards when I'd replace the headers onto the car. I'm not gonna drive the car around with the CEL on, no matter what!
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post #15 of 24 (permalink) Old 12-27-2017, 12:38 AM
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Without a lift, all the work done on jackstands it took me about 2 hours to install the Kooks Mids originally. Given that I now know the process, I could have it done in half that time. If you really wanted to make your life simple, do some DT shorty headers with the Solo high flow cats and all you'd have to do then is change out the cats if they aren't already CARB approved.

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post #16 of 24 (permalink) Old 12-27-2017, 09:40 AM
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Originally Posted by NTrails View Post
I'm not gonna hang my hat on finding a SMOG station willing to risk their entire business by illegally giving me a PASS on my visual inspection out of the goodness ("sympathetic"?) of their heart... doesn't sound likely. And those who say "put headers onnitt and forget about it..." don't realize that I'd not be able to drive, or even park the car on any street if I did! Not really a viable option for me.
I guess I'm fixated on these "Mid-Pipes" and what the difficulty in removing them (and possibly the cats associated with them) and replacing the factory manifold (and cats, if...) every 2 years for the inspection. I mean, how bad does that Mid-Pipe and Hi-Flow Cat setup look? I'd certainly have it tuned to run properly with whatever setup I'd be running... even re-tuning it for the factory stuff if needed for the inspection, then again afterwards when I'd replace the headers onto the car. I'm not gonna drive the car around with the CEL on, no matter what!
Removing the Kooks Mids and cats is EASY! Take my advice and buy the Kooks. I promise you that you won't regret it! Lol I went through the same agony you are going through now just a few months ago. I am extremely happy with my decision!

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post #17 of 24 (permalink) Old 12-27-2017, 09:43 AM
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BTW you won't have to retune it if you put the stock manifolds on. Just leave the rear O2s tuned out and forget about them. The car will run just fine.

Edit: when you tune out the rear O2s the only thing you are doing is telling the ECM not to record a DTC in memory and not to illuminate the CEL, THAT'S IT! This way you aren't constantly aggravated by the Check Engine Light (CEL) and constantly reading the same Diagnostic Trouble Code (DTC)

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post #18 of 24 (permalink) Old 12-27-2017, 11:10 AM
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BTW you won't have to retune it if you put the stock manifolds on. Just leave the rear O2s tuned out and forget about them. The car will run just fine.

Edit: when you tune out the rear O2s the only thing you are doing is telling the ECM not to record a DTC in memory and not to illuminate the CEL, THAT'S IT! This way you aren't constantly aggravated by the Check Engine Light (CEL) and constantly reading the same Diagnostic Trouble Code (DTC)

Brother, the "Trails & Tribulations" you guys in Calif. have to go through. Earthquakes, taxes, some Whacko Politicians & their all telling you what's good for you. Whew!!!!!!!!!
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post #19 of 24 (permalink) Old 12-27-2017, 01:21 PM
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Brother, the "Trails & Tribulations" you guys in Calif. have to go through. Earthquakes, taxes, some Whacko Politicians & their all telling you what's good for you. Whew!!!!!!!!!
Yeah, but Jan 1st we'll have legal recreational weed lol

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post #20 of 24 (permalink) Old 12-28-2017, 12:05 AM
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Originally Posted by NTrails View Post
I'm not gonna hang my hat on finding a SMOG station willing to risk their entire business by illegally giving me a PASS on my visual inspection out of the goodness ("sympathetic"?) of their heart... doesn't sound likely. And those who say "put headers onnitt and forget about it..." don't realize that I'd not be able to drive, or even park the car on any street if I did! Not really a viable option for me.
I guess I'm fixated on these "Mid-Pipes" and what the difficulty in removing them (and possibly the cats associated with them) and replacing the factory manifold (and cats, if...) every 2 years for the inspection. I mean, how bad does that Mid-Pipe and Hi-Flow Cat setup look? I'd certainly have it tuned to run properly with whatever setup I'd be running... even re-tuning it for the factory stuff if needed for the inspection, then again afterwards when I'd replace the headers onto the car. I'm not gonna drive the car around with the CEL on, no matter what!
Dude...its not that hard. I've lived here all my life, have had more than a few cars that wouldnt pass smog and ive gotten it done.
Car guys here know where to ask and who does what. Its NOT hard.
My 95 mustang has a big cam and loud AF and I smog it anytime i need to.

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